Crown Zellerbach Corporation

Michael D Fahey

David W Goheen

Harvey L Claussen

A high-strength, high-yield sulfite-modified thermomechanical pulp is formed by subjecting lignocellulose to multistage mechanical attrition, the first stage being conducted at elevated temperature and pressure and the second stage being run under atmospheric conditions. A sulfite chemical is added to the lignocellulose prior to the second stage, the lignocellulose being sulfonated so that a percent bound sulfur level of at least about 0.15% is provided. A novel linerboard composition is unexpectedly produced employing replacement quantities of the above described pulp.

Process for making high-strength, high-yield sulfite-modified

A process for producing organic acid esters of cellulose, in an efficient and rapid manner, which includes confricating cellulose in the presence of esterification chemicals, the confrication step providing the major driving force in conducting the esterification reaction.

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Vancouver, WA, United States of America

Michael D Fahey